JPH0260563B2 - - Google Patents

Description

Detailed Description of the Invention "Industrial Application Field" The present invention is a method in which individual bags each having an opening in a part are continuous from a flat tube-shaped bag material band made of synthetic resin used in an automatic packaging machine. The present invention relates to an automatic continuous band manufacturing device for packaging bags.

``Prior Art'' This kind of packaging bag production apparatus that has been known in the past includes a heat welding device that forms individual bags in sections where a flat tube strip is intermittently transferred, and A discontinuous cut punching device that forms discontinuous cuts on both upper and lower sides near the portion, and a bag opening device that separates only the upper film portion of the discontinuous cut are provided independently and in parallel, and each is provided with a timing control. A system is known in which individual bags are rolled up and manufactured into a bag-like body having an opening by adjusting the operation every time the bag material strip is transferred intermittently (for example, Japanese Patent Publication No. 45259/1983). ing.

``Problem to be Solved by the Invention'' According to such a conventional device, thermal welding, discontinuous cut punching, and formation of the bag opening are performed independently, and therefore, due to the elongation due to the nature of the bag material strip, Or, due to errors in work timing, etc., each work is not performed accurately at the specified intervals,
For example, there are disadvantages in that discontinuous cuts are perforated in the center between the heat-welded parts at predetermined intervals formed in the previous process, or that the bag opening is formed in areas other than the areas where the discontinuous cuts are made. Therefore, a device that performs the three operations of heat welding, perforating discontinuous cuts, and forming the bag opening over time has a high risk of causing irresistible loss of the bag material band, and is impractical. It was scarce.

In view of these circumstances, the present invention has been developed to solve the problem of the conventional method in which the three operations of heat welding, drilling discontinuous cuts, and forming the bag opening are performed independently. An object of the present invention is to provide an apparatus for automatically manufacturing a continuous band of packaging bags having an opening that can simultaneously perform the following steps and eliminate the conventional drawbacks.

"Means and operations for solving the problem" The present invention has been made to achieve the above object, and has the following features: heat-welded parts, discontinuous cut perforations, etc. in the direction of intermittent feeding of the bag material strip from the drum A blade and a bag material band holder are sequentially arranged, and the heat welded part and bag material band holder are each suspended on a frame that moves up and down via springs, and the gap between the heat welded part and the bag material band holder is A discontinuous cut perforation blade is fixed on the stand at the position, and the stand is lowered and the bag material band presser presses the bag material band on the pedestal, and the film on both the top and bottom sides of the bag material band is thermally welded by the heat welding part. Furthermore, the discontinuous cut perforating blade simultaneously cuts into the bag material strip. While maintaining this cut state and with the bag material band presser pressing the bag material band on the pedestal, the bag material band presser is moved by the drive source via the tilting rod to remove the bag material. Only the discontinuous cut portion of the film on one side of the band is opened.

``Example'' The apparatus of the present invention will be described below with reference to an example diagram in which the apparatus is integrated into an automatic bag-forming and packaging apparatus.

FIG. 1 is a diagrammatic representation of the present invention. Briefly, a flat tube-shaped bag material band x made of thermoplastic synthetic resin is transferred from a drum 1 wound into a roll to a dancer roller 2. Being passed around,
The bag is intermittently transferred to a continuous band manufacturing device 3 that simultaneously performs thermal welding, discontinuous cut perforation, and discontinuous cut separation, and after being completely bag-formed via a printing device (not shown) on the way, it reaches a delivery roller 4. Air is blown from the blower 5 near the delivery roller 4 to open the bag, and at the same time, the article to be packaged is thrown into the bag through the opening through the chute 6, and then the bottom seal cutter 7 is used to open the bag. The structure is such that when the section is closed, it is simultaneously divided into each bag body y.

As the dancer roller 2 moves up and down, the drum 1 operates a magnetic sensing switch 8, 9 to intermittently drive a motor 10, and a drum delivery roller 11 and a driven roller rotate through a pulley wound around the motor 10. A shaft is mounted on 11'.
Further, as shown in FIG. 2, the continuous band manufacturing apparatus 3 has a pedestal 14 disposed opposite to a pedestal 13 that moves up and down by the action of a cylinder 12. This frame 13 has a spring 15,
Two bag material straps 1 suspended via 15'
6, 17, and a bag material band guide 18 is also attached. One of the bag material band pressers 16 is fixed to the lower end of a rod 19 that can move up and down with respect to the pedestal 13, and has an elastic body 20 and a heat sealer 21, which is a heat welding part, provided on the bottom surface of the bag material band x. Facing each other, the other bag material band presser 17 is supported by a pedestal 13 only by a spring 15' as an opening part, so that it can swing, and an elastic body 22 is affixed to its lower bottom surface. It faces the bag material strip x and further has an arm 23. This arm 23 has a hole 2
4 is bored, and a cam 27 of a tilting rod 26 that swings from side to side by driving a cylinder 25 as a drive source provided near the pedestal 14 can be fitted into this hole 24. A serrated discontinuous cut perforation blade 28 fixed to the pedestal 13 is vertically disposed in the intermediate part of these bag material band pressers 16 and 17, and a pedestal is provided in correspondence with the discontinuous cut perforation blade 28. 14 is provided with a recess 29. Therefore,
Each time the bag material strip x is intermittently transferred, the cylinder 12
is driven, the pedestal 13 moves downward, and the bag material band presser 1
6 and 17 press the bag material strip x onto the pedestal 14, and at the same time, the heat sealer 21 heat-welds it, and the discontinuous cut perforation blade 28 presses the bag material strip x on the bag material strip x in the vicinity of the heat-welded part. Make continuous cuts. At the same time, the hole 24 of the arm 23 is fitted with the cam 27, the cylinder 25 is driven, and the tilting rod 26 swings to the left as shown in FIG. 17 is moved to the left, the bag material band x is pulled to the left while being pressed, and the upper film of the bag material band x is opened across the discontinuous cut made in the above manner. be. The rear tilting rod 26 moves back to its original position. When these operations are completed, the cylinder 12 is driven and the pedestal 1 is
3 moves upward, and the bag material band pressers 16, 17 are separated from the bag material band x. At this time, the bag material band guide 18 has the function of pressing the bag material band x against the pedestal 14 to separate the bag material band x and the heat sealer 21 from adhering to each other. As a result, the bag material strip x is subjected to the three operations of thermal welding, discontinuous cut punching, and opening of the bag at the same time, and is intermittently transferred to the next step, such as a printing device.

In the device of the above embodiment, the dancer roller 2 is provided with a guide device consisting of a rack and a pinion, and is also provided with a weight in order to obtain the required self-weight.
A magnetic disk 2' is also provided, and when this magnetic disk 2' moves up and down together with the dancer roller 2, magnetic sensing switches 8 and 9 are actuated. The magnetic sensing switches 8 and 9 are concave-shaped and have a part that fits when the magnetic disk 2' moves up and down, and when the magnetic sensing switch 9 is activated, the motor 10 is driven to remove the bag material. The strip x is fed out, which causes the dancer roller 2 to move downward, and the magnetic sensing switch 8 is actuated to stop the motor 10 from being driven, thereby stopping the feeding of the bag material strip x. Further, the feed roller 4 continues to rotate intermittently.

"Effects of the Invention" According to the present invention described above, in the course of intermittently transporting a thermoplastic flat tube-shaped bag material band, each bag body is formed and an opening is formed in a part of the bag body. In addition, it is possible to form a continuous band with heat welding to form the bag body, perforate discontinuous cuts to separate the individual bags, and separate only one side of the discontinuous cut on the top surface of the bag material band to separate the bag bodies. Since the formation of the opening and the opening were performed at the same time, the strength of the heat-welded part of the bag material strip is generally reduced due to melting during heat welding, so the pull was applied to separate only one side of the discontinuous cut. It is not possible to perform the tensioning operation at the same time as heat welding, and if the unfolding operation is performed to separate the parts, there will be problems such as the heat welded parts being cut off.For this reason, in the past, each device was separated. However, compared to a system in which such devices are installed separately and independently, the system is much simpler and more compact, and it is possible to separate each device as in the past. If they are installed independently, it is necessary to adjust the operation timing of each device, and errors in adjustment will occur, but since the present invention can perform all operations at the same time as described above, it is possible to adjust the operation timing of each device. Setting or adjustment is virtually unnecessary. Also,
Since this type of operation timing is not required,
The bag is completely manufactured, and no product loss occurs. In other words, when the discontinuous cut perforation blade cuts into the bag material band, the bag material band presser is moved and opened, so the force from the opening movement of the bag material band presser is applied to the heat welded area by the discontinuous cut perforation blade. As a result, the discontinuous cut perforating blade also has the function of a presser, preventing it from cutting from the heat welded area. Since the opening section, which is separated only on one side, is integrated into a single frame, the line length is shortened, making the entire device more compact, speeding up manufacturing, and reducing the number of parts. It's done.

Furthermore, a discontinuous cut is formed near the heat-welded part that forms the bag, and the bag is opened close to the perforation blade that forms the discontinuous cut, and at this time, the bag material band is With the discontinuous cut perforation blade digging in, only the top surface of the bag material strip is pulled by the frictional force of the bag material strip holder suspended by a spring to form an opening, so the opening action is performed by the spring. If the acting force is constant from the starting point to the end, and if the bag material band is pulled from side to side at the discontinuous cut using a pusher made of a friction wheel as in the past, the bag material strip can be completely separated at the upper and lower cuts. This eliminates the drawback that the continuous band may be broken.

[Brief explanation of the drawing]

FIG. 1 is a configuration diagram showing an example in which the present invention is implemented integrally with an automatic bag making and packaging device, and FIG. 2 is a longitudinal sectional view showing a continuous band manufacturing device for automatic packaging bags having an opening according to the present invention. , FIG. 3 is a second diagram showing the operating state of the automatic packaging bag continuous band manufacturing device having an opening.
FIG. 4 is a partially enlarged sectional view of FIG. 3; x...bag material band, 1...drum, 2...dancer roller, 3...continuous band manufacturing device, 4...feeding roller,
13... Frame, 14... Receiver, 15, 15'... Spring, 16, 17... Bag material band presser, 18... Bag material band guide, 19... Rod, 20, 22... Elastic body,
21...heat sealer, 23...arm, 24...hole,
25...Cylinder, 26...Tilt rod, 27...Cam,
28...Discontinuous cut perforation blade.

Claims (1)

[Claims] 1 Disposed between a mechanism that intermittently pays out flat tube-shaped bag material strips made of thermoplastic synthetic resin from a drum and a mechanism that winds up the fed bag material strips or sends them to other processing equipment. and a pedestal for receiving the bag material strip, and a pedestal that moves up and down at a position opposite to the pedestal across the bag material strip, and each pedestal has a heat welding part and a bag material spool presser attached by a spring. is suspended, and a discontinuous cut perforation blade is fixed by being positioned between the heat welding part and the bag material band presser; A hole is made in the bag material band presser, into which one end of the tilting rod is inserted, by making a cut in the bag material band, and lowering the frame for the bag material band presser to press the bag material band onto the holder, When the bag material band presser is inserted into the hole of the bag material band, only the discontinuous cut in the upper film of the above-mentioned discontinuous cuts cut into both the upper and lower films of the bag material band with the discontinuous cut perforating blade. A drive source is connected to swing the drive source to move the discontinuous cut perforation blade in the direction away from the discontinuous cut perforation blade that can be opened, and the heat welded part, the discontinuous cut perforation blade, and the bag material band presser are moved in the direction of feeding out the bag material band. 1. A continuous band manufacturing device for automatic packaging bags, characterized in that the openings are arranged sequentially toward each other.